Filter circuit

Details Filter circuit Filter circuit

1994-03-29

1995-10-24

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327317, 330305, H03K 500, H03B 100

Patent

active

054613361

ABSTRACT:
There is disclosed a filter circuit wherein a current control portion (12) controls a constant current (I.sub.2) specifying the sum of currents flowing in transistors (T119, T120) of a control portion (11) and transistors (T19, T20) of a control portion (9) on the basis of a potential difference between an output voltage (V.sub.1) of an operational amplifier (7) and a constant voltage (V.sub.3) whereby, if there is a difference in voltage level between a control voltage (V.sub.2) of the control portion (9) and the constant voltage (V.sub.3) of the control portion (11), a filter control portion performs the same control as a reference filter output characteristic of a filter portion (8) to an ideal input-output characteristic.

REFERENCES:
patent: 5028884 (1991-07-01), Kondo et al.
A Theses from the National Convention of Television Society, 1986, Y. Okada, et al., "Luminance Signal LSI of Adjustment-Free Filters for VTR".

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